Method and System for Reconstruction of Cest Contrast Image

2. The method for reconstruction of a CEST contrast image according to claim 1, wherein step S107 specifically comprises: obtaining CEST images based on ω values and the σk, ωk, Ak and δ parameter maps by a formula of the Lorentzian line shape model of CEST effect.

6. The system for reconstruction of a CEST contrast image according to claim 4, wherein the simulated CEST image generating unit obtains CEST images based on ω values and the σk, ωk, Ak and δ parameter maps by a formula of the Lorentzian line shape model of CEST effect.

7. The system for reconstruction of a CEST contrast image according to claim 4, wherein the PROPELLER undersampling unit performs Fourier transformation on the CEST images corresponding to each ω value to obtain corresponding k-space data, wherein the k-space data of the CEST image corresponding to an ω value corresponds to a PROPELLER sampling blade of a particular sampling trajectory; each PROPELLER sampling blade collects several k-space lines of the corresponding CEST image; if there are M ω values, M sampling blades are present correspondingly; the angle of the first sampling blade is 0, and a difference between the angles of adjacent sampling blades is 180°/M, that is, 180°/M is taken as an increment for the angle of sampling blade; the angle of the sampling blade corresponding to the mth ω value is 180° (m−1)/M, and the sampling trajectory of M sampling blades spans a circle in the k-space.